<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>switch语句</title>
        <script>
            var a;
            switch (a) {
                case 1:
                    alert("number")
                    break;
                case "abc":
                    alert("string")
                    break;
                case true:
                    alert("true")
                    break;
                case null:
                    alert("null")
                    break;
                case undefined:
                    alert("undefined")
                    break;

            }




        </script>



    </head>
    <body>
        
    </body>
</html>